A Renntech modified Mercedes McLaren SLR shatters the SLR quarter mile record and runs 10.43 @ 133 mph at Palm Beach International Raceway on April 22, 2011. The SLR sports a hand-built 5.4 L (331.9 cu in), supercharged, all-aluminium, SOHC V8 engine with three valves per cylinder. When stock, the Lysholm-type twin-screw supercharger produces approximately 0.9 bar (13 psi) of boost and generates 617 horsepower (460 kW; 626 PS) @6500 rpm. This RENNtech modified SLR makes approximately 750 horsepower and is equipped with a RENNtech, modified supercharger pulley for more boost as well as a tuned ECU. In addition, this SLR has RENNtech Hi Flo exhaust and Hoosier Drag Radials.